Perl Split Function - How to assign a specify array value to a variable in one line

Question

Is this a way of using a one-liner to assign an array value to a variable using the split function.

I have the following code. This works.

my @Fields = split(',',@_[0]);
my $Unit = @Fields[2];

Wondering if it could be written in one like the following, they are returning syntax errors.

my $Unit = split(',',@_[0])[2];

my $Unit = @(split(',',@_[0]))[2];

You should use a scalar sigil when referring to an array slice of 1 element: my $unit = $fields[2]. Same with split(',',$_[0]). When using @_, it is better to copy the value to avoid changing it. E.g. my $arg = shift; my @fields = split ',', $arg; — TLP
– TLP, Commented May 17, 2022 at 10:26

Shawn · Accepted Answer · 2022-05-17 04:59:21Z

3

Your second one is very close. Drop that leading @:

my $Unit = (split(',', $_[0]))[2];

(Note $_[0] instead of the one-element array slice @_[0]... if you have use warnings; in effect like you should, that would give you one.)

answered May 17, 2022 at 4:59

Shawn

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Shawn Over a year ago

If you have a lot of fields, you might consider (split(',', $_[0], 4))[2] to avoid it returning a longer list than is needed. What would normally be the 4th, 5th, 6th, etc. elements are all part of the 4th one with that length modifier.

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